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<!DOCTYPE html>
<title>CSS Anchor Positioning Test: Dynamically change position via position-fallback property</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#fallback">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
body { margin: 0; }
@position-fallback --fallback1 {
@try {
left: anchor(--a1 right);
}
}
#anchor {
anchor-name: --a1;
width: 100px;
height: 100px;
}
#anchored {
position: absolute;
width: 100px;
height: 100px;
}
</style>
<div id="anchor"></div>
<div id="anchored"></div>
<script>
test(() => {
assert_equals(anchored.offsetLeft, 0);
}, "Initial static left position is 0");
test(() => {
anchored.style.positionFallback = "--fallback1";
assert_equals(anchored.offsetLeft, 100);
}, "Left position set to right edge of anchor with @position-fallback");
</script>
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